AMERICAN COLEOPTERA. 100 



Synopsis of the MAIiACHIIDJE of the luited States. 



BY GEO. H. HORN, M. D. 



The following synopsis of our Malachiidae contains all the species 

 known to me as inhabiting our territory. Collops is not included, as 

 a descriptive catalogue has already been presented in the preceding 

 volume of these Transactions. 



The following table will enable our genera to be readily recognized. 

 All the genera have eleven-jointed antennae : 



Anterior tarsi % 4-jointed. 



Head long; first joint of antennae cylindrical Tropliimiis. 



Head short; first joint of antennae deformed Teiiinopsophiis. 



Anterior tarsi 5-jointed in both sexes. 



Elytra very short; body apterous in both sexes. 



Second joint of anterior tarsus £, prolonged over third Eildeodes. 



Elytra covering abdomen or nearly so. 

 Antennae inserted on the front nearly between the eyes. 



Second joint of anterior tarsus % not prolonged Malachius. 



Second joint slightly covering the third. 



Head elongate Tanaops. 



Antennae inserted at anterior edge of front near the sides. 

 Anterior tarsus of male simple, joint 2 not prolonged. 

 Form elongate, legs long; females apterous. 



Anterior tarsi % stouter than in female Micro! ipus. 



Form broad, legs moderate; female winged. 

 Anterior tarsi similar in the sexes. 



Elytra similar in the sexes Anthocoinus. 



Elytra prolonged and appendiculate in % Pseudebwus. 



Anterior tarsi with second joint prolonged over the third. 



Elytra similar in the sexes Attain*. 



In the above table MalacMus includes Hapalorhinus ; Microlipus 

 includes also Charopus, sp. Lee. List; Pseudebxus contains the 

 species under Ebscus in the List; Attains includes Acletus, Lee. In 

 the determination of the genera the course indicated by Duval has 

 been followed. In a previous paper I intimated that some of our 

 species of Attains might be Ebseus, under the impression that the 

 second joint was prolonged obliquely inwards. There appears to be a 

 greater degree of motion between the second aud third joints of the 



